24p from Nano to XDCAM via U1?

for an upcoming shoot, the client wants 24p on xdcam disc.
not having luck burning via U1

i'm using 1280/720 23.98p in the F3 (non drop on both F3 and nano - it's actually grey'd out on the F3 to NDF, so i set the nano to NDF)
on the nano Record PSF/Prog is DEactivated
Remove 3:2 pulldown is ACTIVATED

i see 720pd23 - 50M across the bottom of nano

BUT - when i attempt to burn via the U1, i get:

"The Finder can't complete the operation because some data in FP446001.mxf can't be read or written
Error code -36"

thoughts?

I have successful playback of the nano card by using Content Browser and it shows as 720/23.98 but it just won't transfer….